So for C1, C2,C3 can use Magnetic Clutch : . In simple words this contains 2 plates and the gap is filled with magnetorheological fluid (MR fluid). There is fluid storage and electro maganets. so when the clutch needs engaged, the fluid fills the gas and electric field is applied so the fluid truns to solid. At time of disengagement, remove the magnetic field and store the fluid back to container.